MECHANICAL BULKMETERS CM Series

Transcription

1 PRO MEA 10 PRODUCTS - Measurement MECHANICAL BULKMETERS CM Series Positive displacement liquid measuring instruments Free from installation effects Accuracy consistent between calibration levels Suitable for use in distribution depots and aviation refuelling vehicles Stepless calibration system Flow Rates of 22 igpm (100 lpm) to 1200 igpm (5500 lpm)

2 CM SERIES METERS Avery-Hardoll bulkmeters are precision made, positive displacement, liquid measuring instruments,which maintain accurate metering over long periods of operation. Simplicity of design and construction together with sustained accuracy make these meters ideally suited for use on aviation refuelling vehicles and in oil terminals. OPERATION The positive displacement principle is the ONLY accurate method of measuring fluid flow. No other technology can achieve such accuracy because measurement becomes inferred, that is indirect and subject to assumption.the Avery Hardoll bulkmeter directly converts volume to rotational output with minimum scope for error and with minimal disturbance from surrounding conditions, eg. turbulence from nearby valves, bends, etc. The product enters the meter through the inlet manifold (1) and causes the rotor (4) to revolve by pressure on the vanes (3). The proximity of the rotor (4) to the body (2) forms an efficient seal, whilst the profile of the casing ensures that the vanes (3) are guided through the measuring crescent (5), where the volume of product is accurately measured. An extension shaft driving through a pressure tight gland in the meter front cover, transmits the rotor revolutions to the calibrating gearing 6) which drives the counter (7). CONSTRUCTION MANIFOLD: BODY: VANES: ROTOR: COVERS: BEARINGS: SEALS: Ductile iron (single/double capsule) Fabricated steel (all builds) Cast Aluminium (6 Triple only) Ni-Resist cast iron Carbon Aluminium or Ni-Resist cast iron Carbon Steel Stainless steel High Nitrile or Fluorocarbon

3 SPECIFICATION Maximum Working pressure: 10.5 bar (150 psi) Test pressure: 21 bar (300 psi) Temperature range: -28ºC to 100ºC Volume per revolution: 2.27 litres (Single capsule) 4.54 litres (Double capsule) 6.82 litres (Triple capsule) 9.08 litres (4 capsule) Repeatability typically:.02% Typical accuracy curves for basic meter build (10:1 turndown) CALIBRATION Calibration adjustment is provided to minimize the meter error at any selected flowrate. Adjustment is stepless; no gear changing is necessary; and the calibration screw is easily accessible after breaking a seal and removing a sealing screw. All meters are tested to 300 psi (21 bar). All Avery-Hardoll meters are tested before despatch at a range of flowrates and test certificates can be supplied if requested. The fluid used for testing is odorless kerosene. Specific gravity at 60/60ºF, 15/15ºC = 0.8 Viscosity at 60ºF, 15ºC = 2.4 centistokes. Suggested correction to be made to the calibrating mechanism when used with products with different viscosities as follows: Gasoline + 0.1% Kerosene 0.0% Gas Oil - 0.1% Fuel Oil % + means increase counter readings - means decrease counter readings.

4 CM Series Meters Flow Range NOTE: All meters are available with steel manifold with flat/raised face flanges.

5 and Dimensions

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7 PRESSURE LOSS The low pressure drop for the CM series of Avery-Hardoll bulkmeters is shown opposite. VISCOUS PRODUCTS Avery-Hardoll bulkmeters can be used on all petroleum products of all viscosities that are normally pumped. However there is obviously an increase in pressure drop with more viscous fuels which will, under normal circumstances, limit the maximum flowrate obtainable. It is recommended that the pressure drop through a bulkmeter should not exceed 15 psi (1 bar), above which the load on the bearings will start to cause wear. Consequently when using products with viscosities (at operating conditions) above 100 centistokes, it is necessary to reduce the maximum permitted flowrate. As a guide it is suggested that the pressure drop through the meter should not exceed 10 psi (0.7 bar) for continuous running at maximum speed or 15 psi (1 bar) for continuous running at half speed. METER ACCESSORIES A full range of accessories is available for use with all Avery-Hardoll bulkmeters and these are described in the following paragraphs. Details may be obtained from each relevant leaflet. COUNTERS The meters are fitted with standard Veeder-Root counters, having afive large figure zeroising drum and a seven figure small non-zeroising totaliser and can be supplied to read in any of the following units: MASTERLOAD Imperial Gallons US Gallons Cubic Metres Litres Decalitres Electronic calibration, display and control system suitable for both depot and vehicle applications. TICKET PRINTER Available with or without identifier, in the following forms: 1. Batch delivery, starting at zero and showing the amount delivered. 2. Accumulative tote giving initial and final totaliser figures. MECHANICAL PRESET AND PRESET VALVE A Veeder-Root preset register with 5 figure resettable counter is used to preset a batch to be delivered. This controls a lever operated preset valve via a mechanical linkage, providing two stage closure and precise shut off of flow. MECHANICAL PRESET WITH MICROSWITCHES Microswitches can be fitted to the preset register to control pump start and stop, and solenoid operated preset valves. RATE OF FLOW INDICATOR SWIVEL

8 EXTENDED COUNTER DRIVE Provided for installations where the counter is required to be read at height above the bulkmeter. VERTICAL MOUNTING All sizes of Avery-Hardoll CM Series bulkmeters can be supplied with counters and counter extensions arranged so that the meters can be mounted in vertical pipework. STRAINER Essential to prevent damage to the meter and is available with 40, 60, 80, 100 and 120 mesh baskets, with either cast iron or cast steel body. AIR SEPARATOR Prevents entrained air reaching the meter. FLOW GOVERNOR Limits flow rate at maximum meter capacity when several meters are fed from one pump.